Sanding drum



W. LOEFFLER.

SANDIN'G DRUM. APPLICATION FILED FEB-28. 1919.

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lW'. LOEFFLER.

. SANDING DRUM.

APPLICATION FILED FEB.28,1919. v15412,289. Patented Apr. 11, 1922.

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WILLIAM LOEFFLEB. F SHEBOYGAN, WISCONSIN.

SANDING DRUM.

Speclication of Letters Patent.

Patented Apr. 11, 1922.

Application lcd February 28, l1919. Serial No. 279,848. i

To all 707mm t may] concern.'

Be it known that I, VILLIAM LOEFFLER, a citizen ot the United States, and resident of Sheboygan, in the county of Sheboygan and State ot Wisconsin7 have invented new and useful lmprovementsiu Sanding Drums, of which the tollowing'is a description, reference being had to the accompanying drawings` which are a part of this speciiication.

The-invention relates to sanding drums and has for its general objects to improve the construction of drums, and particularly `to providemeans- Ifor making a close joint Abetween the opposite ends of the sand paper.

attached to the drum, to provide for quick removal and renewal ofthe sandpaper and to provide a simple and efficient means for balancing the drum.

The inventionfurther `consists in the novel construction and `combination of parts hereinafter set forth and more particularly deviinedby claims at the conclusion hereof.

`In the drawings:

Fig.` 1 is a view of the device embodying Vthe invention7 parts'beingbroken away and parts being-shown in section; Y Y

r FigQ is an end viewo'f the device;

lFig. 3 is asection taken on the line 3--3 l 'oft Fig. 5.;

e so' 4 tion of the drum shown in Fig. 3;

Fig. 4C isan enlarged detail view of a por- Iig. 5 is a vertical sectional view through a. plan view ofv a modified form QFig. 74 is a' section taken on the line 7-7 Fig. S is a detail view taken on lthe* line ot Fig. 75, parts being broken away.

The drum, designated generallyby the vIlllllleral Y, is secured to a lshaft 8 provided with a ixedfpulley 9` and a loose pulley l() for belt drive,VY The shaft 8 is journalled 'at its endsin bearing blocks l1, each of lwhich has recesses 12in its ends receiving packing rings 13 Vwhich prevent dust Yfrom working into the bearing. Eachbea-ring also carries Yhood lll secured thereto by a stud bolt 15 anda wing. nut 16 and projecting inwardly( at the ends-*of the-block and downwardlyon the sides thereof to keep out dust. Each i .block 1.1 is pivotally supported upon a chan- `nel bracket 17 by bolts 17 so that the bearings are self-alining. The brackets are se Vcured tothe frame 18.

The drum consists of a hollow metal cylinder 19 having a removable segment 20, a. yielding backing 2l, means vfor securing said vbacking to the outer face ot the drum and tions. The segment 20 has depending portions 20 in line with the ends i9 and partitions 28. The drum is provided with a lengthwise extending opening 7 to receive the segment and with openings or notches 28 in its ends and partitions in which the portions 20 of the segment are fitted and seated. The partitions are also provided with openings 34 extending from one side ot the notches 28 therein to permit the clamping plates 34 and 43 to pass said partitions.

The removable segment 2,0 is provided with a plurality of lugs 22 secured to or formed integral with the inner side ot said segment and carrying adjustable set screws 23 provided with lock nuts 23. The lugs 22 with the screws 234 act as ulcrums andY 'taslteners so as to permit the segment being ment 2O carries lugs 24 having alined holes 25 to receive a locking rod QG'whieh loosely passes through apertures 27 in the endsof the drum and in the partitions 28 within the drum andalso passes through arcuate slots 29 in arnisBO mounted on a shatt 3l journaled insaid partitions and in the ends of Vthe drum, said slots b eing eccentric to the shaft 3l so that the turning of said shaft 31 will `cause the rod' 26 to move inwardly and thus pull inwardly on the lugs 24 and the segment so that it will be moved into a po* sition contiguous with the remainder oit the shell, as shown in Fig. 3. To assist in inserting the rod 26 one end has a. threaded boro receiving the threaded end ot an extension shaft 26 provided with a handle.

Y drum.

ment 20. In each instance it is secured by a clamping plate 34 extending the length of the interior oi" the drum and means for retaining said plate in clamping position, said plate being provided with pointed pins 36 which are forced through the carpet and are seated in openings 37 adjacent the edge to which the carpet is secured.A To retain said plate in position ay plurality of bolts 38, passed through the drum shell, apertures 39 in the plate and apertures 40v in washers 41, are provided with wing nuts 42 whereby the vscrewing up of the nuts 42 moves the washers'4l in engagement with the plate 34 to clamp it against the edge ot' the carpet cngaging the inner periphery ot the drinn. The end edges of the sandpaper are secured.

to the edges v32 and 33 in veach instance by a v clamping plate 43 having apertures 44 in line with washers 41 to permit movement of the plate 43 with respect thereto. The end edge of the sandpaper is clamped between the plates 34 and 43 by wing nuts 45 mounted on bolts 46 and bearing against the plate 43;

f With this construction the backing may be heldfclamped while the sandpaper is readily removed by loosening` up the nuts to release the plate 43 from clamping engagement therewith so that said plate may be moved back upon the washers 41 and a new piece of sand paper then put in place and clamped to the drum and Vits segment by the plate 43V and nuts 45.` TWhen theedges of the sandpaper aregthus secured the segment 2O is swung down to Ythe position shown in Fig. 3, as previously described, and in this way the backing and sandpaper are held tightly on the drum.

This manner of clamping t-he sandpaper. Y* to the drum and the segment to the drum by means within the drum, produces a tight joint with edges continuous with the'druni surface 'and thereby prevents pounding at the edge of the joint and consequently prolongs the lite of .the sandpaper as it will wear Von the complete circumference of the In order to balance the drum a plurality of couplings 4l are adjustably mounted on the shaft and receive one of the ends ot the Y threaded shafts 48 which at theirot-her ends are screwed into apertures in the drum, ritter the coupling has been turned on ltheshalft to the desired position so that a rough balancing adjustment may be inade. rIhese shafts 43 cari-y weights 49 adjustable thereon and secured thereto in adjusted position for fine balancing b f set screws 50. The rods and weights balance the clamping means previously referred to so that there is a coniplete absence o` vibration while the drum is running, which is beneficial to the operator.

y Iii-the construction shown in Fig. 6,; the adjoining edges ofthe drum and the reiiiovable segment 20 similar to the segment 20 ai'e itornied at an angle to the axis ot the drinn which results in an even wearing of the sandpaper carried by the drum and7 as shown in dotted lines, the clamping means do not extend the length ofV the drum but separate clamping means similar to those previously described extend from each end to the intermediate portion oit the drum.

Brackets 52 secured to the traine adjacent one side of the drum and having curved sup porting surfaces 53 are provided so that thc segment 20 or 20 may be Supported thereon during removal or replacement of the sandpaper. i Y

What `I claim asiiew and desire to secure by Letters Patent is: Y

1In a. sanding drurmthel combination, with a shaft, of a hollow drummounted thereon and provided with amovable section, projections onrsaid section engaging the inner side of the drumadjacent one joint between said section-and drum, a piece of abrasive material removably secured at the other joint between said sectiongand drum,

lugs extending inwardly from said section,

a revoluble locking shaft mountedwithin the drum, arms mountedon said shaft and provi'dedwith eccentric slots, and a shaft passing through said slots and apertures in said lugs whereby said segment will be moved inwardly to a position flush with the drum and retained'in :this position on turning said locking shaft. Y ,Y Y l 2. In a sanding drum, the. combination of a hollow drinn having solid ends and a partition and provided with aV lengthwise extending opening in its side andhnotches in saidendsrand partition, -a segment fitting into saidV opening andhaving portions seat- ;,ed in said notches, and means including clamping plates for 'securingt a piece of abrasive material to saidsegment'and drum, said partition having a notchtherein extend- .ing from one side of the first named notch 3. Ina sanding drunfnthe combination,

withthe drum, oi' a clamping `fiatbar,*clainp ing boltsrcarried bythe drum 'torY securing backing material between said drum. and said bai', a second clamping flat barliaving open-VV ings througlif which said clamping bolts pass, nuts for said bolts, and'other clamping bolts carried by the first bar for ksecuring a piece of abrasive material between said bars. Y

4. In a sanding drinn7 Vthe combination, y

with aV shaft, of a hollow drum mounted thereon and provided with a removable secc tion7 iulcruining projections on saidsection engaging the inner'side of the" drum adjacent one joint between said sectionl and drum, a piece of abrasive material'surround'-L ing the drinn`r `clampingf plates yonthe 'section and drum receiving the edges of said abrasive material within the drum at the other joint between said section and drum, und means within the drum for moving the section to bring its surface contiguous to the surface of the remainder of the drum.

ln a sanding drum7 the combination with the drum, of a clamping flat bar, clamping bolts carried by the drum and passing through openings in said bar, spaeing washers on said bolts engaging said bar, wing nuts on said bolts for clamping the bar to secure backing material-between said drum and said bar, a second clamping flat bar having openings through which said bolts and washers pss, clamping bolts carried by the first bur and extending through openings in the second bar, wing nuts mounted on said last named bolts for bringingthe bars together to secure :t piece of abrasive material between them, said Washers permitting relative movement between the bars to permit replacement of abrasive material between them without loosening the second bar.

In testimony whereof, I aix my signature, in presence of two witnesses.

WILLIAM LOEFFLER. Titnesses WILLIAM S. LOEFFLER, Jr., FRANK J. KELI. 

